Fluid handling – Processes
Patent
1993-10-28
1996-04-02
Michalsky, Gerald A.
Fluid handling
Processes
13762565, 25112905, 2511291, F15B 13044
Patent
active
055031749
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a solenoid valve and a method for adjusting specific throughflow cross sections in alternative functional positions of the solenoid slide valve having a control magnet system including two exciting windings, which when alternately charged with current, or charged with different control currents, displace an armature provided for displacement of a valve body toward the single exciting winding or the more strongly energized exciting winding, with the armature having a spring-centered basic position which either corresponds to a specific open state of the valve in one of its two alternative functional positions or to an intermediate position, for example, a third functional position corresponding to the non-excited state of the magnetic system, and with the exciting currents used to excite the two magnetic windings being subjected to pulsed modulation, causing the armature together with the movable valve body to perform a constant reciprocating motion.
BACKGROUND OF THE INVENTION
In a known fashion, the friction existing between the movable valve body and the valve element of the valve that is integral with the housing, as soon as the valve is to be actuated, must be reduced to the relatively low value of sliding friction to ensure reliable response of the valve and especially to avoid the development of stick-slip effects, especially during the small strokes that correspond to only a fraction of the maximum control stroke. The time intervals within which certain functional positions and/or opening cross sections of flow paths in the valve are reached are kept as short as possible in this manner.
An exciting winding associated with one of the functional positions of the solenoid valve is energized, and a ripple is imposed on its exciting current that results in a pulsating rise and fall of the magnetic forces that "pull" the armature against the action of a return spring into its required position. This required position, which corresponds to a desired throughput cross section of the valve in this functional position, must result from the equilibrium of the magnetic positioning force generated by the excitation of the winding and by the restoring force of the respective acting valve spring, which increases with deflection of the armature. In order to achieve short switching times for solenoid valves controlled in this manner, powerful return springs must be used and high exciting currents must be generated to energize the exciting windings, powerful return springs to permit a rapid return of the armature to its basic position when the excitation is shut off, and high exciting currents in order to displace the armature sufficiently rapidly against the action of the powerful return springs. To accelerate the switching processes, as proposed in British 885,121, it is also possible, when shutting off the excitation of one exciting winding briefly, to excite the winding that produces magnetic forces in the opposite direction, but this would entail considerable control-engineering expense and/or considerable expense for additional control windings.
SUMMARY OF THE INVENTION
The goal of the invention is to provide an improved solenoid valve and a method for actuating a solenoid value which enables a more rapid response behavior of a double-stroke solenoid valve and the necessary mechanical deflections of the armature and the valve body movably coupled therewith, with comparatively low magnetic forces having to be imposed by the control magnet system.
According to the present invention, a method for adjusting throughflow cross-sections and alternative functional positions of a slide valve constructed as a solenoid valve having a control magnetic system which comprises two exciting windings is proposed with the method comprising the steps of alternately engaging or energizing with different control currents the two exciting windings so as to displace an armature providing for displacing a valve body toward the energized exciting winding. The armature has a spring-c
REFERENCES:
patent: 3129724 (1964-04-01), Hartwig
patent: 4310143 (1982-01-01), Determan
patent: 4741365 (1988-05-01), Van Ornum
patent: 4859005 (1989-08-01), Rey et al.
patent: 4979542 (1990-12-01), Mesenich
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